PDF malware analysis — malicious · fd3d29aac2e0fbf2

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 20:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: b221cb29974a715118d4911a80063250 SHA-1: c45de64ef53e1ec674d8fa825619ed89455e3037 SHA-256: fd3d29aac2e0fbf29f70e9ecdf7538d2c1bf62950b3972baada12f9f9518046b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or redirection scheme designed to lead users to harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fd8dbac86---34131039542.pdf In PDF document text
- https://songhong.info/userfiles/file/dosijorewikaxakusotuz.pdfIn PDF document text
- https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/dc44f6c3213327405bbbb1000497a20e/sosirov.pdfIn PDF document text
- https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4168tl1hflmoghsn4ub5uhh6t1/88031907817.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/573c0a43af08458715c51b8305ed1fa0/33282717081.pdfIn PDF document text
- http://smitheaster.org/clients/861344/File/fawikoziz.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1292d8133b---xewak.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a53ee1dd8---4145463207.pdfIn PDF document text
- https://basealimentare.it/webroot/files/fck_uploads/File/15594723426.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71a9006b1---81607981547.pdfIn PDF document text
- http://hrudolf.com/userfiles/28543423240.pdfIn PDF document text
- http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/gerofujufatadusapo.pdfIn PDF document text
- http://umhouses.com/uploads/files/kolafu.pdfIn PDF document text
- http://tw-echen.com/uploads/files/202108161946519288.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cfdf42cc68e2c8e395a6d3f138577f9d/vabejofoxipobefuvajugama.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099734076fc1---15223074396.pdfIn PDF document text
- https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cfcsa531qfp56labm7v4ndvb9o/74589998940.pdfIn PDF document text
- http://www.polni.si/Images/files/27085429909.pdfIn PDF document text
- http://envigest.cz/upload/file/8263197062.pdfIn PDF document text
- http://klpa.net/userData/board/file/nanuneselowaz.pdfIn PDF document text
- https://kermoulin.com/userfiles/file/76218567023.pdfIn PDF document text
- https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/fuguzum.pdfIn PDF document text
- https://fo-prefectures.com/pages/files/jasekitovuf.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be897ce256a---62249287255.pdfIn PDF document text
- https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/151e1fc958f017728b0471cab0bc70c7/tamesibefufexawe.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=push+strategy+marketing+definitionPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d7ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7AC	11060 bytes
SHA-256: `d0b6abc1918435900a60ead70f5ac029e88d0c0af1d65d5ad66a077ff008b940`
`font_01_sfnt_off0000f12b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF12B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001093d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1093D	16368 bytes
SHA-256: `532c56c6e9a06100b257b59612b7eed368fde24ac8bc74736c7bb4f038fecc29`

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